From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Power curve graph for the Spectre engine with an open exhaust, comparing different camshafts and pistons.
| Identifier | ExFiles\Box 4\1\ 01-page235 | |
| Date | 28th April 1935 | |
| SPECTRECodename for Phantom III POWER CURVE (OPEN EXHAUST) Sp.{Mr Spinney} 9 COMPRESSION RATIO 6:1 ① NO. 2 UNIT - H.S. 1536 - CAMSHAFT - AEROLITE PISTONS ② CALCULATED CURVE OF NO. 2 UNIT USING SEMI-SPLIT PISTONS FROM BENTLEY RESULTS. ③ NO. 3 UNIT - (E.{Mr Elliott - Chief Engineer} 86371) 112 1/2° CAMSHAFT (E.{Mr Elliott - Chief Engineer} 84546) PISTONS SEMI-SPLIT. B.H.P. R.P.M. M.E.P. LBS / SQ" TIMING WITH .020 CL'CE H.S. 1536 CAMSHAFT TDC EC 10° IC 53° EO 48° E.{Mr Elliott - Chief Engineer} 86371 CAMSHAFT TDC EC 10° IC 44° EO 37.5° L.H.S / 28.4.35 | ||